Hello Jim
That sound logical for me.
I was afraid to screw up the pattern on my 80 meter array by adding more
radials under only one tower....
Thanks very much for your input.Appreciate it very much..
NOEL
----- Original Message -----
From: "Jim Brown" <jim@audiosystemsgroup.com>
To: "Tower Talk List" <towertalk@contesting.com>
Sent: Friday, April 13, 2007 15:10
Subject: Re: [TowerTalk] info on radials repartition...
> On Fri, 13 Apr 2007 13:11:31 +0000, VE2RYY wrote:
>
> >I am using a 2 element phased vertical (towers) on 80 meters.There
> >are about 75 radials under each tower for 80M.
> >Now I want to use only one of these towers for 160 meter
>
> The potential problem is that if you add radials to only one tower,
> the DIFFERENCE between the two towers will screw up the pattern on
> 80 by unbalancing that array. If it were my antenna system, I would
> either leave it alone or add radials to both towers as symmetrically
> as possible.
>
> I'm assuming that your radials are on the ground, not elevated. On-
> the-ground radials do not resonate -- they are simply a path for
> return current from the antenna, and more is better. All the science
> (as opposed to war stories) I've seen on non-elevated radials says
> that for a single tower, more is better, more closer to the tower is
> better, and longer is better, but that adding 16 or 32 1/4 wave
> radials to 75 1/8 wave radials is not likely to make a LARGE
> difference (I'd guess less than a dB for adding 16 based on data
> I've seen). The current version (20th) of the ARRL Antenna Book has
> a particularly good discussion of this.
>
> 73,
>
> Jim Brown K9YC
>
>
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